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Alumina/silica aerogel with zinc chloride as an alkylation catalyst

Alumosilikatni aerogel sa cink-hloridom kao katalizator za reakcije alkilovanja

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2001
0352-51390110685O.pdf (110.4Kb)
Authors
Orlović, Aleksandar
Janaćković, Đorđe
Drmanić, Saša
Marinković, Zorica
Skala, Dejan
Article (Published version)
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Abstract
The alumina/silica with zinc chloride aerogel alkylation catalyst was obtained using a one step sol-gel synthesis, and subsequent drying with supercritical carbon dioxide. The aerogel catalyst activity was found to be higher compared to the corresponding xerogel catalyst, as a result of the higher aerogel surface area, total pore volume and favourable pore size distribution. Mixed Al-O-Si bonds were present in both gel catalyst types. Activation by thermal treatment in air was needed prior to catalytic alkylation, due to the presence of residual organic groups on the aerogel surface. The optimal activation temperature was found to be in the range 185-225 ºC, while higher temperatures resulted in the removal of zinc chloride from the surface of the aerogel catalyst with a consequential decrease in the catalytic activity. On varying the zinc chloride content, the catalytic activity of the aerogel catalyst exhibited a maximum. High zinc chloride contents decreased the catalytic activity o...f the aerogel catalyst as the result of the pores of the catalyst being plugged with this compound, and the separation of the alumina/silica support into Al-rich and Si-rich phases. The surface area, total pore volume, pore size distribution and zinc chloride content had a similar influence on the activity of the aerogel catalyst as was the case of xerogel catalyst and supported zinc chloride catalysts.

Alumosilikatni aerogel sa cink-hloridomkao katalizator za reakcije alkilovanja, dobijen je jednostepenim sol-gel postupkom i naknadnim sušenjem sa natkritičnim ugljen-dioksidom. Utvrđeno je da je katalitička aktivnost aerogel - katalizatora viša od katalitičke aktivnosti odgovarajućeg kserogel - katalizatora, zbog veće specifične površine i ukupne zapremina pora aerogel - katalizatora, kao i povoljnije raspodele veličina pora. Oba tipa gel - katalizatora poseduju mešovite Al-O-Si veze u strukturi alumosilikatnog nosača. Zbog prisustva zaostalih organskih grupa na površini aerogel katalizatora, pre katalitičkog alkilovanja neophodna je aktivacija katalizatora zagrevanjem na povišenoj temperaturi u atmosferi vazduha. Optimalna temperatura aktivacije je u opsegu 185-225 ºC, dok je viša temperatura aktivacije rezultirala uklanjanjem cink-hlorida sa površine katalizatora i značajnim smanjenjem katalitičke aktivnosti. Zavisnost katalitičke aktivnosti od sadržajacink-hlorida je pokazala maksi...mum. Visoki sadržaj cink-hlorida je doveo do pada katalitičke aktivnosti usled zapunjavanja pora katalizatora ovim jedinjenjem i separacije alumosilikatnog nosača na faze bogate aluminijumom i silicijumom. Utvrđeno je da specifična površina, ukupna zapremina pora, raspodela veličina pora i sadržaj cink-hlorida, imaju sličan uticaj na aktivnost aerogel-katalizatora kao i na aktivnost kserogel-katalizatora i katalizatora dobijenih nanošenjem cink-hlorida na različite nosače.

Keywords:
aerogel catalyst / Friedel-Crafts alkylation catalyst / sol-gel derived catalyst
Source:
Journal of the Serbian Chemical Society, 2001, 66, 10, 685-695
Publisher:
  • Serbian Chemical Society, Belgrade

ISSN: 0352-5139

WoS: 000171672100003

Scopus: 2-s2.0-0039296240
[ Google Scholar ]
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URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/395
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Orlović, Aleksandar
AU  - Janaćković, Đorđe
AU  - Drmanić, Saša
AU  - Marinković, Zorica
AU  - Skala, Dejan
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/395
AB  - The alumina/silica with zinc chloride aerogel alkylation catalyst was obtained using a one step sol-gel synthesis, and subsequent drying with supercritical carbon dioxide. The aerogel catalyst activity was found to be higher compared to the corresponding xerogel catalyst, as a result of the higher aerogel surface area, total pore volume and favourable pore size distribution. Mixed Al-O-Si bonds were present in both gel catalyst types. Activation by thermal treatment in air was needed prior to catalytic alkylation, due to the presence of residual organic groups on the aerogel surface. The optimal activation temperature was found to be in the range 185-225 ºC, while higher temperatures resulted in the removal of zinc chloride from the surface of the aerogel catalyst with a consequential decrease in the catalytic activity. On varying the zinc chloride content, the catalytic activity of the aerogel catalyst exhibited a maximum. High zinc chloride contents decreased the catalytic activity of the aerogel catalyst as the result of the pores of the catalyst being plugged with this compound, and the separation of the alumina/silica support into Al-rich and Si-rich phases. The surface area, total pore volume, pore size distribution and zinc chloride content had a similar influence on the activity of the aerogel catalyst as was the case of xerogel catalyst and supported zinc chloride catalysts.
AB  - Alumosilikatni aerogel sa cink-hloridomkao katalizator za reakcije alkilovanja, dobijen je jednostepenim sol-gel postupkom i naknadnim sušenjem sa natkritičnim ugljen-dioksidom. Utvrđeno je da je katalitička aktivnost aerogel - katalizatora viša od katalitičke aktivnosti odgovarajućeg kserogel - katalizatora, zbog veće specifične površine i ukupne zapremina pora aerogel - katalizatora, kao i povoljnije raspodele veličina pora. Oba tipa gel - katalizatora poseduju mešovite Al-O-Si veze u strukturi alumosilikatnog nosača. Zbog prisustva zaostalih organskih grupa na površini aerogel katalizatora, pre katalitičkog alkilovanja neophodna je aktivacija katalizatora zagrevanjem na povišenoj temperaturi u atmosferi vazduha. Optimalna temperatura aktivacije je u opsegu 185-225 ºC, dok je viša temperatura aktivacije rezultirala uklanjanjem cink-hlorida sa površine katalizatora i značajnim smanjenjem katalitičke aktivnosti. Zavisnost katalitičke aktivnosti od sadržajacink-hlorida je pokazala maksimum. Visoki sadržaj cink-hlorida je doveo do pada katalitičke aktivnosti usled zapunjavanja pora katalizatora ovim jedinjenjem i separacije alumosilikatnog nosača na faze bogate aluminijumom i silicijumom. Utvrđeno je da specifična površina, ukupna zapremina pora, raspodela veličina pora i sadržaj cink-hlorida, imaju sličan uticaj na aktivnost aerogel-katalizatora kao i na aktivnost kserogel-katalizatora i katalizatora dobijenih nanošenjem cink-hlorida na različite nosače.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Alumina/silica aerogel with zinc chloride as an alkylation catalyst
T1  - Alumosilikatni aerogel sa cink-hloridom kao katalizator za reakcije alkilovanja
EP  - 695
IS  - 10
SP  - 685
VL  - 66
UR  - conv_482
ER  - 
@article{
author = "Orlović, Aleksandar and Janaćković, Đorđe and Drmanić, Saša and Marinković, Zorica and Skala, Dejan",
year = "2001",
abstract = "The alumina/silica with zinc chloride aerogel alkylation catalyst was obtained using a one step sol-gel synthesis, and subsequent drying with supercritical carbon dioxide. The aerogel catalyst activity was found to be higher compared to the corresponding xerogel catalyst, as a result of the higher aerogel surface area, total pore volume and favourable pore size distribution. Mixed Al-O-Si bonds were present in both gel catalyst types. Activation by thermal treatment in air was needed prior to catalytic alkylation, due to the presence of residual organic groups on the aerogel surface. The optimal activation temperature was found to be in the range 185-225 ºC, while higher temperatures resulted in the removal of zinc chloride from the surface of the aerogel catalyst with a consequential decrease in the catalytic activity. On varying the zinc chloride content, the catalytic activity of the aerogel catalyst exhibited a maximum. High zinc chloride contents decreased the catalytic activity of the aerogel catalyst as the result of the pores of the catalyst being plugged with this compound, and the separation of the alumina/silica support into Al-rich and Si-rich phases. The surface area, total pore volume, pore size distribution and zinc chloride content had a similar influence on the activity of the aerogel catalyst as was the case of xerogel catalyst and supported zinc chloride catalysts., Alumosilikatni aerogel sa cink-hloridomkao katalizator za reakcije alkilovanja, dobijen je jednostepenim sol-gel postupkom i naknadnim sušenjem sa natkritičnim ugljen-dioksidom. Utvrđeno je da je katalitička aktivnost aerogel - katalizatora viša od katalitičke aktivnosti odgovarajućeg kserogel - katalizatora, zbog veće specifične površine i ukupne zapremina pora aerogel - katalizatora, kao i povoljnije raspodele veličina pora. Oba tipa gel - katalizatora poseduju mešovite Al-O-Si veze u strukturi alumosilikatnog nosača. Zbog prisustva zaostalih organskih grupa na površini aerogel katalizatora, pre katalitičkog alkilovanja neophodna je aktivacija katalizatora zagrevanjem na povišenoj temperaturi u atmosferi vazduha. Optimalna temperatura aktivacije je u opsegu 185-225 ºC, dok je viša temperatura aktivacije rezultirala uklanjanjem cink-hlorida sa površine katalizatora i značajnim smanjenjem katalitičke aktivnosti. Zavisnost katalitičke aktivnosti od sadržajacink-hlorida je pokazala maksimum. Visoki sadržaj cink-hlorida je doveo do pada katalitičke aktivnosti usled zapunjavanja pora katalizatora ovim jedinjenjem i separacije alumosilikatnog nosača na faze bogate aluminijumom i silicijumom. Utvrđeno je da specifična površina, ukupna zapremina pora, raspodela veličina pora i sadržaj cink-hlorida, imaju sličan uticaj na aktivnost aerogel-katalizatora kao i na aktivnost kserogel-katalizatora i katalizatora dobijenih nanošenjem cink-hlorida na različite nosače.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Alumina/silica aerogel with zinc chloride as an alkylation catalyst, Alumosilikatni aerogel sa cink-hloridom kao katalizator za reakcije alkilovanja",
pages = "695-685",
number = "10",
volume = "66",
url = "conv_482"
}
Orlović, A., Janaćković, Đ., Drmanić, S., Marinković, Z.,& Skala, D.. (2001). Alumina/silica aerogel with zinc chloride as an alkylation catalyst. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 66(10), 685-695.
conv_482
Orlović A, Janaćković Đ, Drmanić S, Marinković Z, Skala D. Alumina/silica aerogel with zinc chloride as an alkylation catalyst. in Journal of the Serbian Chemical Society. 2001;66(10):685-695.
conv_482 .
Orlović, Aleksandar, Janaćković, Đorđe, Drmanić, Saša, Marinković, Zorica, Skala, Dejan, "Alumina/silica aerogel with zinc chloride as an alkylation catalyst" in Journal of the Serbian Chemical Society, 66, no. 10 (2001):685-695,
conv_482 .

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